I just brought my new travel trailer home about 10 days ago and parked it in the backyard. Have not managed to go camping yet. About all I have done is to try out the furnace a couple of times to make sure it worked OK and monkey with the radio a little. Last night when I left the camper, I pushed the "battery check" button and only 1 light came on. Can the battery drain down that fast? Today I went out and pushed the button and no light came on. So, I drug out the cords and plugged the camper into 110 volt. Then I again pushed the button and all 4 lights came on, although obviously the battery was not charged yet. Is this normal?